Rather than buy a replacement part from a local hardware store, 3D printing offers up the opportunity to produce what you need at home, when you need it. But what if you have to replace a whole unit? If a project from Cornell University's Creative Machines Lab is any indication, such things may soon be possible. A research team has managed to 3D print the cone, coil and magnet of a loudspeaker, and then use it to throw out sounds from a digital audio player.